Prof. Mel Rosenberg is the world's leading expert on bad breath. He joins Melinda Beck and Wendy Bounds on Lunch Break with the final word on how to banish such unpleasant mouth odor for good.

This transcript has been automatically generated and may not be 100% accurate.

... I ... the the ... only twenty tool that we got Melinda Beck she's the last regional telecoms with that with us right now ... and Dr Mal Rosenberg is Professor if you mean ... microbiology tell of the universe ignored partly is co founder of the International Society of bread ... alone are ... real surge his job he has spent his I phone Intel of the ... thing so much for being here Melinda ... and yes he has quickly how big of a problem is bad for us just nationally on ... about twenty five percent of ... adults worldwide have it and that is a lot of bad breath that is a lot of bad breath now people wanna know what causes expected helping out what to do it to do about it ... Dr Rosenberg ... post nasal drip and bacteria and software I hear all these things tell me what's at play here ... well our theory is that most cases of bad breath ... okra because post nasal drip accumulates on the ... back of the top and ... Anders Pettersson bacteria on the back of the time ... that future fight is like a protein ... entry ... terrible smelling molecules ... and mostly stealth journalists ... Evan and then show the chair on the beest lunch break and is eating RightNow's everyone listen up ... I Dr Rosenberg looking through that I mean isn't a matter that I've heard you should be brushing your time does that help ... and not brushing with your plastic and cleaners that are very helpful ... began to get all the way back your throat ... not everybody can do it properly ... that Belinda we see some people going into a closet sometimes a lake their wrists are there under a blanket trying to see if they actually had that Brett is that a smart way to go about it ... no laughing with one of the things that I'm a sheen of in my career ... it turned out not to be a good way to check yourself ... because there's so many subjective ... aam a King's entering into it I mean you can smell the odor of your tongue ... it you can't agree that ... objectively ... and you also say there's something import about eating breakfast Dr Rosenberg what why is that what what what what should we be needing to cut down that track the morning ... well we don't understand exactly why defying accumulates this to ... dismiss the new has ... bought a few eco all awesome breakfasts are including CA Russ Britt salad not things like that you will reduce sulphur emissions from Nirmal of ... I seventy percent ... and also enjoy a healthy breakfast ... and live eleven bring it back to the conversation here I mean in terms of of what scientists can tell about breath in general ... that this can actually be a signal of some health concerns as well ... well yes and and that's with the rest of my stories about this week on ... all these preparation intestine can not diagnose and monitor ... diseases by Fiat brand but in this case ... about ninety percent of that I'm ... that that that that where where I've really stands for these issues in the math that Dr presenters time that ... Dr Rosenberg was good as what is that how one meter high and what Palin meter measure where you find one ... okay well you can buy the California how he hears actually in the instrument that was originally developed to test environmental sulfur ... in the industry ... then we kind of ... applying to dental clinics and research ... so it measures the level of all styles sulfur in the breath which is linked to the level of the order itself ... in just a guy that Dr Rosenberg this is the guy you really wanna listen two thousand was an indie today ... is Dr hasn't hurt his co founded International Society ... of bread ... or research thank so much for being with this Melinda Beck thank you for this more research by you both in the story out with this video is and also on another that you explore all of the health ... implications of bad things for being with us ...